434 lines
15 KiB
Python
434 lines
15 KiB
Python
# Copyright (c) Twisted Matrix Laboratories.
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# See LICENSE for details.
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from twisted.trial import unittest
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from twisted.python import components
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from twisted.pair import ip, raw
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from zope import interface
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@interface.implementer(raw.IRawDatagramProtocol)
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class MyProtocol:
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def __init__(self, expecting):
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self.expecting = list(expecting)
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def datagramReceived(self, data, **kw):
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assert self.expecting, 'Got a packet when not expecting anymore.'
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expectData, expectKw = self.expecting.pop(0)
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expectKwKeys = expectKw.keys()
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expectKwKeys = list(sorted(expectKwKeys))
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kwKeys = kw.keys()
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kwKeys = list(sorted(kwKeys))
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assert expectKwKeys == kwKeys, "Expected %r, got %r" % (expectKwKeys, kwKeys)
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for k in expectKwKeys:
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assert expectKw[k] == kw[k], "Expected %s=%r, got %r" % (k, expectKw[k], kw[k])
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assert expectKw == kw, "Expected %r, got %r" % (expectKw, kw)
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assert expectData == data, "Expected %r, got %r" % (expectData, data)
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class IPTests(unittest.TestCase):
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def testPacketParsing(self):
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proto = ip.IPProtocol()
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p1 = MyProtocol([
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(b'foobar', {
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'partial': 0,
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'dest': '1.2.3.4',
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'source': '5.6.7.8',
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'protocol': 0x0F,
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'version': 4,
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'ihl': 20,
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'tos': 7,
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'tot_len': 20+6,
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'fragment_id': 0xDEAD,
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'fragment_offset': 0x1EEF,
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'dont_fragment': 0,
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'more_fragments': 1,
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'ttl': 0xC0,
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}),
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])
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proto.addProto(0x0F, p1)
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proto.datagramReceived(b"\x54" #ihl version
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+ b"\x07" #tos
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+ b"\x00\x1a" #tot_len
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+ b"\xDE\xAD" #id
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+ b"\xBE\xEF" #frag_off
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+ b"\xC0" #ttl
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+ b"\x0F" #protocol
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+ b"FE" #checksum
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+ b"\x05\x06\x07\x08"
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+ b"\x01\x02\x03\x04"
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+ b"foobar",
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partial=0,
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dest='dummy',
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source='dummy',
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protocol='dummy',
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)
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assert not p1.expecting, \
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'Should not expect any more packets, but still want %r' % p1.expecting
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def testMultiplePackets(self):
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proto = ip.IPProtocol()
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p1 = MyProtocol([
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(b'foobar', {
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'partial': 0,
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'dest': '1.2.3.4',
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'source': '5.6.7.8',
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'protocol': 0x0F,
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'version': 4,
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'ihl': 20,
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'tos': 7,
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'tot_len': 20+6,
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'fragment_id': 0xDEAD,
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'fragment_offset': 0x1EEF,
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'dont_fragment': 0,
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'more_fragments': 1,
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'ttl': 0xC0,
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}),
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(b'quux', {
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'partial': 1,
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'dest': '5.4.3.2',
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'source': '6.7.8.9',
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'protocol': 0x0F,
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'version': 4,
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'ihl': 20,
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'tos': 7,
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'tot_len': 20+6,
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'fragment_id': 0xDEAD,
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'fragment_offset': 0x1EEF,
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'dont_fragment': 0,
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'more_fragments': 1,
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'ttl': 0xC0,
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}),
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])
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proto.addProto(0x0F, p1)
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proto.datagramReceived(b"\x54" #ihl version
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+ b"\x07" #tos
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+ b"\x00\x1a" #tot_len
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+ b"\xDE\xAD" #id
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+ b"\xBE\xEF" #frag_off
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+ b"\xC0" #ttl
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+ b"\x0F" #protocol
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+ b"FE" #checksum
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+ b"\x05\x06\x07\x08"
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+ b"\x01\x02\x03\x04"
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+ b"foobar",
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partial=0,
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dest='dummy',
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source='dummy',
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protocol='dummy',
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)
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proto.datagramReceived(b"\x54" #ihl version
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+ b"\x07" #tos
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+ b"\x00\x1a" #tot_len
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+ b"\xDE\xAD" #id
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+ b"\xBE\xEF" #frag_off
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+ b"\xC0" #ttl
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+ b"\x0F" #protocol
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+ b"FE" #checksum
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+ b"\x06\x07\x08\x09"
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+ b"\x05\x04\x03\x02"
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+ b"quux",
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partial=1,
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dest='dummy',
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source='dummy',
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protocol='dummy',
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)
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assert not p1.expecting, \
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'Should not expect any more packets, but still want %r' % p1.expecting
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def testMultipleSameProtos(self):
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proto = ip.IPProtocol()
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p1 = MyProtocol([
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(b'foobar', {
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'partial': 0,
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'dest': '1.2.3.4',
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'source': '5.6.7.8',
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'protocol': 0x0F,
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'version': 4,
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'ihl': 20,
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'tos': 7,
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'tot_len': 20+6,
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'fragment_id': 0xDEAD,
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'fragment_offset': 0x1EEF,
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'dont_fragment': 0,
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'more_fragments': 1,
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'ttl': 0xC0,
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}),
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])
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p2 = MyProtocol([
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(b'foobar', {
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'partial': 0,
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'dest': '1.2.3.4',
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'source': '5.6.7.8',
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'protocol': 0x0F,
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'version': 4,
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'ihl': 20,
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'tos': 7,
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'tot_len': 20+6,
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'fragment_id': 0xDEAD,
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'fragment_offset': 0x1EEF,
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'dont_fragment': 0,
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'more_fragments': 1,
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'ttl': 0xC0,
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}),
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])
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proto.addProto(0x0F, p1)
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proto.addProto(0x0F, p2)
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proto.datagramReceived(b"\x54" #ihl version
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+ b"\x07" #tos
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+ b"\x00\x1a" #tot_len
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+ b"\xDE\xAD" #id
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+ b"\xBE\xEF" #frag_off
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+ b"\xC0" #ttl
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+ b"\x0F" #protocol
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+ b"FE" #checksum
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+ b"\x05\x06\x07\x08"
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+ b"\x01\x02\x03\x04"
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+ b"foobar",
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partial=0,
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dest='dummy',
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source='dummy',
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protocol='dummy',
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)
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assert not p1.expecting, \
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'Should not expect any more packets, but still want %r' % p1.expecting
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assert not p2.expecting, \
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'Should not expect any more packets, but still want %r' % p2.expecting
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def testWrongProtoNotSeen(self):
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proto = ip.IPProtocol()
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p1 = MyProtocol([])
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proto.addProto(1, p1)
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proto.datagramReceived(b"\x54" #ihl version
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+ b"\x07" #tos
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+ b"\x00\x1a" #tot_len
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+ b"\xDE\xAD" #id
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+ b"\xBE\xEF" #frag_off
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+ b"\xC0" #ttl
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+ b"\x0F" #protocol
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+ b"FE" #checksum
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+ b"\x05\x06\x07\x08"
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+ b"\x01\x02\x03\x04"
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+ b"foobar",
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partial=0,
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dest='dummy',
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source='dummy',
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protocol='dummy',
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)
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def testDemuxing(self):
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proto = ip.IPProtocol()
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p1 = MyProtocol([
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(b'foobar', {
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'partial': 0,
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'dest': '1.2.3.4',
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'source': '5.6.7.8',
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'protocol': 0x0F,
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'version': 4,
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'ihl': 20,
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'tos': 7,
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'tot_len': 20+6,
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'fragment_id': 0xDEAD,
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'fragment_offset': 0x1EEF,
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'dont_fragment': 0,
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'more_fragments': 1,
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'ttl': 0xC0,
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}),
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(b'quux', {
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'partial': 1,
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'dest': '5.4.3.2',
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'source': '6.7.8.9',
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'protocol': 0x0F,
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'version': 4,
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'ihl': 20,
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'tos': 7,
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'tot_len': 20+6,
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'fragment_id': 0xDEAD,
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'fragment_offset': 0x1EEF,
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'dont_fragment': 0,
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'more_fragments': 1,
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'ttl': 0xC0,
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}),
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])
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proto.addProto(0x0F, p1)
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p2 = MyProtocol([
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(b'quux', {
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'partial': 1,
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'dest': '5.4.3.2',
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'source': '6.7.8.9',
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'protocol': 0x0A,
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'version': 4,
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'ihl': 20,
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'tos': 7,
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'tot_len': 20+6,
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'fragment_id': 0xDEAD,
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'fragment_offset': 0x1EEF,
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'dont_fragment': 0,
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'more_fragments': 1,
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'ttl': 0xC0,
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}),
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(b'foobar', {
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'partial': 0,
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'dest': '1.2.3.4',
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'source': '5.6.7.8',
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'protocol': 0x0A,
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'version': 4,
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'ihl': 20,
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'tos': 7,
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'tot_len': 20+6,
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'fragment_id': 0xDEAD,
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'fragment_offset': 0x1EEF,
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'dont_fragment': 0,
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'more_fragments': 1,
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'ttl': 0xC0,
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}),
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])
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proto.addProto(0x0A, p2)
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proto.datagramReceived(b"\x54" #ihl version
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+ b"\x07" #tos
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+ b"\x00\x1a" #tot_len
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+ b"\xDE\xAD" #id
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+ b"\xBE\xEF" #frag_off
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+ b"\xC0" #ttl
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+ b"\x0A" #protocol
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+ b"FE" #checksum
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+ b"\x06\x07\x08\x09"
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+ b"\x05\x04\x03\x02"
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+ b"quux",
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partial=1,
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dest='dummy',
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source='dummy',
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protocol='dummy',
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)
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proto.datagramReceived(b"\x54" #ihl version
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+ b"\x07" #tos
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+ b"\x00\x1a" #tot_len
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+ b"\xDE\xAD" #id
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+ b"\xBE\xEF" #frag_off
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+ b"\xC0" #ttl
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+ b"\x0F" #protocol
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+ b"FE" #checksum
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+ b"\x05\x06\x07\x08"
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+ b"\x01\x02\x03\x04"
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+ b"foobar",
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partial=0,
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dest='dummy',
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source='dummy',
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protocol='dummy',
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)
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proto.datagramReceived(b"\x54" #ihl version
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+ b"\x07" #tos
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+ b"\x00\x1a" #tot_len
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+ b"\xDE\xAD" #id
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+ b"\xBE\xEF" #frag_off
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+ b"\xC0" #ttl
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+ b"\x0F" #protocol
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+ b"FE" #checksum
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+ b"\x06\x07\x08\x09"
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+ b"\x05\x04\x03\x02"
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+ b"quux",
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partial=1,
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dest='dummy',
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source='dummy',
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protocol='dummy',
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)
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proto.datagramReceived(b"\x54" #ihl version
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+ b"\x07" #tos
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+ b"\x00\x1a" #tot_len
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+ b"\xDE\xAD" #id
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+ b"\xBE\xEF" #frag_off
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+ b"\xC0" #ttl
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+ b"\x0A" #protocol
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+ b"FE" #checksum
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+ b"\x05\x06\x07\x08"
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+ b"\x01\x02\x03\x04"
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+ b"foobar",
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partial=0,
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dest='dummy',
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source='dummy',
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protocol='dummy',
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)
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assert not p1.expecting, \
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'Should not expect any more packets, but still want %r' % p1.expecting
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assert not p2.expecting, \
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'Should not expect any more packets, but still want %r' % p2.expecting
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def testAddingBadProtos_WrongLevel(self):
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"""Adding a wrong level protocol raises an exception."""
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e = ip.IPProtocol()
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try:
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e.addProto(42, "silliness")
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except components.CannotAdapt:
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pass
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else:
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raise AssertionError('addProto must raise an exception for bad protocols')
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def testAddingBadProtos_TooSmall(self):
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"""Adding a protocol with a negative number raises an exception."""
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e = ip.IPProtocol()
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try:
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e.addProto(-1, MyProtocol([]))
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except TypeError as e:
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if e.args == ('Added protocol must be positive or zero',):
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pass
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else:
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raise
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else:
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raise AssertionError('addProto must raise an exception for bad protocols')
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def testAddingBadProtos_TooBig(self):
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"""Adding a protocol with a number >=2**32 raises an exception."""
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e = ip.IPProtocol()
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try:
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e.addProto(2**32, MyProtocol([]))
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except TypeError as e:
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if e.args == ('Added protocol must fit in 32 bits',):
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pass
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else:
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raise
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else:
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raise AssertionError('addProto must raise an exception for bad protocols')
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def testAddingBadProtos_TooBig2(self):
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"""Adding a protocol with a number >=2**32 raises an exception."""
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e = ip.IPProtocol()
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try:
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e.addProto(2**32+1, MyProtocol([]))
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except TypeError as e:
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if e.args == ('Added protocol must fit in 32 bits',):
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pass
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else:
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raise
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else:
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raise AssertionError('addProto must raise an exception for bad protocols')
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